Evaluations of carbon and dissolved material material transport by submarine groundwater discharge in coastal zone of East Asia

东亚沿海地区海底地下水排放碳和溶解物质迁移的评价

基本信息

批准号：
17403002
负责人：
TANIGUCHI Makoto
金额：
$ 6.27万
依托单位：
Research Institute for Humanity and Nature
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

Submarine groundwater discharge (SGD) is recognized as an important pathway from land to ocean, not only for water and dissolved material transports but also for ecosystem in the coastal zone. The seepage meters (for SGD flux), piezometers (for groundwater potential and dissolved material transports), optic fiber cable (for sea bottom temperature) and resistivity (fresh-salt water distribution) measurements had been made to evaluate the flux and quality of the SGD in several palaces in East Asia, including, Korea, Taipei, Bangkok, Manila, Osaka.A multidisciplinary approach was recently taken to assess the potential importance of groundwater seepage to nutrient inputs into Manila Bay, The Philippines. Three lines of seepage meters were installed in transects along the coast at Mariveles, Bataan Province during the period between 8-10 January 2005. The seepage rates along the northern most line showed the highest submarine groundwater discharge (SGD) at rates of 7.1-10.9 cm day^<-1>. The overall average seepage flux was 5.1±5.4 cm/day with a range of 0-26cm/day. Additional methodologies employed included automatic seepage meters, resistivity measurements, and use of natural radon as a groundwater tracer. Seepage meter and tracer results provided consistent results of estimates of SGD into Manila Bay. Both methods also showed that seepage fluxes are not steady-state but are modulated by the tides. Resistivity profiles show that the saline-freshwater interface moves on a tidal time scale. Our results show that dissolved inorganic nitrogen (DIN) fluxes via SGD are comparable in magnitude to DIN fluxes from each of the two major rivers that drain into Manila Bay

海底地下水排放（SGD）被认为是从土地到海洋的重要途径，不仅是水和溶解的材料运输，而且对于沿海地区的生态系统而言。渗水仪（用于SGD通量），打击器（用于地下水潜力和溶解的材料运输），光纤电缆（用于海底温度）和抗性（新鲜盐水分布）的测量值，以评估East Asia，Taipery to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to to，地下水渗漏对养分投入到菲律宾马尼拉湾的潜在重要性。在2005年1月8日至10日之间，沿着巴丹省马里维尔斯（Mariveles）的海岸的横断面中安装了三条渗流仪。北部最多线的渗流率显示出最高的海底地下水排放（SGD），速度为7.1-10.9 cm Day^<-1>。总平均渗透通量为5.1±5.4 cm/天，范围为0-26 cm/天。采用的其他方法包括自动渗漏仪，抗性测量以及自然ra作为地下水示踪剂的使用。渗流表和示踪剂结果提供了对马尼拉湾的SGD估算结果一致的结果。两种方法还表明，渗透通量不是稳态，而是由潮汐调节。电阻率曲线表明，盐水水平的界面在潮汐时间尺度上移动。我们的结果表明，通过SGD溶解的无机氮（DIN）通量与从两条主要河流中的每条河流中的DIN通量相当，它们排入马尼拉湾